body {
    background-image: url("../image/bg.png");
    background-color: #b8e5f8;
    background-position: center 0;
    background-repeat: no-repeat;
    background-attachment: fixed;
    background-size: cover;
    -webkit-background-size: cover;
    -o-background-size: cover;
    -moz-background-size: cover;
    -ms-background-size: cover;
    font-family: -apple-system,BlinkMacSystemFont,Helvetica Neue,PingFang SC,Microsoft YaHei,Source Han Sans SC,Noto Sans CJK SC,WenQuanYi Micro Hei,sans-serif;
    -webkit-tap-highlight-color: rgba(26,26,26,0);
}

.content{
    width:450px;
    margin: 15% auto;
}

form{
    margin: 25px 30px 15px 30px;
}